(Yuba-Sutter, CA) – If you’re giving your special someone a Valentines gift today that includes metallic balloons, the folks at PG&E would appreciate it if you hung on to them.

According to the electric company, more metallic balloons are sold for Valentine’s Day than any other holiday, and each year the company see’s an uptick in outages caused by metallic balloons drifting into overhead power lines. Last year, PG&E cited metallic balloons to be the cause of 415 power outages that disrupted electric service to more than 210,000 homes and businesses across northern and central California.

Unlike latex helium balloons, metallic balloons can stay inflated and floating for two to three weeks, posing a hazard to power lines and equipment, even days after being released outside.